1、 Fast-growing crystals in 2 colors: purple and blue crystals glow in the dark; crystal chemistry has never been faster (grow in 3-7 days), fun and colorful! The perfect educational gift for boys and girls. 2、 Easy growing: Easy-to-follow instructions and 2 growth vessel chambers make growing your crystals easier than ever. Our new clear seed stones can be left in your delicate crystals and grown crystals can be placed directly into your display. 3、 Night light display: Use the UV pen in the set to illuminate the crystal, put the crystal into the dark after a few minutes, the crystal will emit a very nice green light! Help inspire a lifelong love of science and learning with this fun educational activity for kids. 4、 Science and education toy set: hands-on experiments make children fall in love with chemistry, witness the growth process of crystals, cultivate observation ability, enjoy the fun of chemistry, and fall in love with science! 5、 Ideal gift: Our Science Experiment Kits are packaged in a beautifully colored box, which is an ideal gift for your growing child, whether it's Christmas, birthday, school day, or book day! Recommended for children aged 8 years or older.